JP2001020774A - Idling and restart system for engine of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent overheat resulting from stoppage of an engine in stopping a vehicle immediately after high speed running. SOLUTION: A vehicle is provided with a controller 32 having a function 35 to automatically stop an engine when the vehicle is stopped and restart it when depression of a brake pedal is released. The vehicle is further provided with a cooling water circulation pump 36 driven by an engine 31. Moreover, the controller 32 has a function to judge whether the vehicle is on a highway or not at stoppage of the vehicle, and prohibit idling of the engine when it is judged that the vehicle is on a highway at stoppage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically stopping and restarting an engine of a vehicle.

[0002]

2. Description of the Related Art When a vehicle temporarily stops at a traffic light or the like while driving, the engine is automatically stopped, and when the vehicle is started, the engine is automatically restarted to thereby improve fuel efficiency. There is an engine automatic stop / restart device designed to improve the above (see JP-A-8-291725).

[0003]

However, in the conventional device in which the pump for circulating the cooling water for the engine is driven by the engine crankshaft, no consideration is given to stopping the vehicle immediately after traveling at high speed. If you drive at high speed to the toll booth and stop the vehicle, or if you have been driving at high speed on the highway and stopped due to traffic congestion ahead,
The engine is automatically stopped, and the cooling water circulation pump does not operate due to the engine stop, and there is a possibility of overheating. Similarly, when the vehicle stops immediately after leaving the highway after high-speed driving, the engine is automatically stopped, and there is a possibility of overheating at this time.

[0004] In this case, Japanese Patent Application Laid-Open No. 9-42003 discloses that in a vehicle having an engine having a supercharger, in order to prevent an excessive rise in temperature of the supercharger, it is estimated from an accelerator pedal operation amount and an engine speed. A system is disclosed in which the automatic stop of the engine is prohibited when the temperature of the turbocharger exceeds a predetermined value. However, in this conventional device, since the method for estimating the supercharger temperature is complicated, application to a vehicle having an engine without a supercharger is difficult.

Accordingly, an object of the present invention is to prevent overheating caused by stopping the engine when the vehicle is stopped immediately after high-speed running by prohibiting the automatic stop of the engine when the vehicle is stopped immediately after high-speed running.

[0006]

According to a first aspect of the present invention, as shown in FIG. 7, when a predetermined driving condition is satisfied, the engine 31 of the vehicle is automatically stopped, and when another predetermined driving condition is satisfied. Function 33 for automatically restarting the engine 31
A vehicle having a controller 32 having a cooling water circulation pump 34 driven by the engine 31. The controller 32 determines whether or not the vehicle is on an expressway when the vehicle is stopped. A function 36 for prohibiting the automatic stop of the engine 31 when the vehicle is on an expressway.

According to a second aspect of the present invention, as shown in FIG. 8, the engine 31 of the vehicle is automatically stopped when a predetermined driving condition is satisfied, and is automatically stopped when another predetermined driving condition is satisfied. A vehicle provided with a controller 32 having a function 33 of restarting the engine, a cooling water circulation pump 34 driven by the engine 31,
A function 41 for determining whether or not the vehicle has just stopped on the highway when the vehicle stops, and a function for inhibiting the automatic stop of the engine 31 when the vehicle has just stopped on the highway when the vehicle stops. 42.

According to a third aspect of the present invention, as shown in FIG. 9, the engine 31 of the vehicle is automatically stopped when a predetermined driving condition is satisfied, and is automatically stopped when another predetermined driving condition is satisfied. A vehicle provided with a controller 32 having a function 33 of restarting the engine, a cooling water circulation pump 34 driven by the engine 31,
Is a function 51 for determining whether or not the vehicle is stopped immediately after high-speed running, and a function 52 for prohibiting the automatic stop of the engine 31 when the vehicle is stopped immediately after high-speed running based on the determination result.
And

In a fourth aspect, in the first aspect, it is determined whether or not the vehicle is on a highway based on information from a navigation system.

[0010] In a fifth aspect, in the second aspect, it is determined whether or not the vehicle has just disappeared on the highway based on information from the navigation system.

According to a sixth aspect of the present invention, in the third aspect, the means for determining whether or not the vehicle is stopped immediately after traveling at a high speed includes determining that the vehicle speed is a first predetermined value V1 (for example, 80 km / h).
Means for determining that the vehicle is running at a high speed when the above state continues for a first predetermined time T1 (for example, 5 minutes), and when the previous determination indicates that the vehicle is running at a high speed, the vehicle speed is less than the first predetermined value V1 The state below the second predetermined value V2 (for example, 60 km / h) smaller than the first predetermined value V1 is the second state.
Means for determining that the vehicle is traveling at a high speed when the vehicle does not continue for a predetermined time T2 (for example, one minute), and when the vehicle speed is equal to or higher than the first predetermined value V1 when the previous determination is not the high-speed traveling. Means for determining that the vehicle is not traveling at a high speed when the vehicle does not continue for a predetermined time T1 or more;
If the state of 2 or less continues for the second predetermined time period T2 or more, there are means for judging that the vehicle is not running at high speed, and means for judging whether or not the vehicle is immediately running at high speed based on the result of these determinations when the vehicle stops.

[0012] In a seventh aspect based on the sixth aspect, the vehicle speed is an average vehicle speed.

[0013]

According to the first invention, when the vehicle stops on the highway, according to the second invention, when the vehicle stops immediately after the vehicle stops on the highway, according to the third invention, the vehicle immediately after running at high speed is stopped. When the vehicle stops, the engine is operated without automatically stopping the engine. For this reason, when the vehicle was stopped because it was running at high speed on the expressway until it reached a tollgate, when the vehicle was stopped due to traffic congestion ahead while it was running at high speed so far on the highway, or when the vehicle was stopped at high speed. When the vehicle stops right after leaving the highway,
In either case, the automatic stop of the engine is prohibited, the operation of the engine is continued, and the cooling water circulation pump operates,
Overheating can be prevented.

According to the fourth and fifth aspects of the present invention, when prohibiting the automatic stop of the engine when the vehicle stops immediately after traveling at high speed,
Since the navigation system is used, the automatic stop of the engine when the vehicle stops immediately after traveling at high speed can be reliably prohibited by a simple method.

According to the sixth aspect of the present invention, it is possible to determine whether or not the vehicle is stopped immediately after traveling at a high speed, even if no navigation system is provided.

According to the seventh aspect, it is possible to reduce the influence of instantaneous acceleration / deceleration when determining whether the vehicle is stopped immediately after traveling at high speed.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG.
Denotes a continuously variable automatic transmission, between which a motor generator (electric motor) 2 is disposed. The rotation of engine 1 or motor generator 2 is transmitted from continuously variable automatic transmission 3 to drive wheels (not shown) via drive shaft 7.

The engine 1 may be a gasoline engine or a diesel engine.
Further, a stepped automatic transmission with a torque converter or a start clutch can be used instead of the continuously variable automatic transmission 3.

The continuously variable automatic transmission 3 includes a torque converter 4
, A forward / backward switching mechanism 5, and a metal belt 6 looped between variable pulleys 6a, 6b.
By changing the pulley ratio of 6b, the speed ratio transmitted through the metal belt 6 changes. In order to drive the variable pulleys 6a and 6b such that the target speed ratio of the continuously variable automatic transmission 3 is set in accordance with the operation state and matches the actual speed ratio which is the ratio of the input speed to the output speed. Primary hydraulic pressure and secondary hydraulic pressure are controlled. Reference numeral 14 denotes an external electric type oil pump for supplying hydraulic pressure required for shifting, which can generate hydraulic pressure even when the engine rotation is temporarily stopped, and can supply the required hydraulic pressure to the continuously variable automatic transmission 3. ing.

The forward / reverse switching mechanism 5 reverses the direction of output rotation between forward and reverse travels. The torque converter 4 transmits input rotational torque to the output side via fluid force, and the input side pole Stoppage of rotation on the output side, such as during low-speed rotation, can be tolerated.

The motor generator 2 is connected directly to the crankshaft of the engine 1 or connected via a belt or a chain, and rotates in synchronization with the engine 1. The motor generator 2 functions as a motor or a generator, and the power control unit 12 controls the function, the number of rotations, the torque, the amount of power generation, and the like.

When the motor generator 2 functions as a motor supplementing the output of the engine 1 or as a motor for starting the engine 1, the current from the battery 13 is supplied via the power control unit 12 and the vehicle When the battery 13 functions as a generator in order to recover the traveling energy of the vehicle, the battery 13 is charged by the current generated through the power control unit 12.

Further, when the vehicle is automatically stopped when the vehicle is temporarily stopped, the engine 1
An automatic stop / restart controller 10 is provided for automatically restarting the engine 1 when the vehicle stops and the engine 1 is stopped by the motor generator 2 when the vehicle starts moving.

For this reason, the automatic stop / restart controller 1
0 indicates the engine speed sensor 9 and the brake sensor 1
1. Signals from the accelerator sensor 15, the shift position sensor 17 of the continuously variable automatic transmission 3, the vehicle speed sensor 18, and the like are input, and the automatic stop and start are controlled based on these signals.

The vehicle is provided with a navigation system 21 for displaying the current position of the vehicle on a road map.
As shown in FIG. 2, the system 21 mainly includes a geomagnetic sensor (direction sensor) 22, a gyro (angular speed sensor) 23, a vehicle speed sensor 24, and a GP mounted on a vehicle.
S (satellite navigation system that measures the absolute position on the earth using radio waves from satellites developed by the US Department of Defense) antenna 2
5. CD-ROM 26 containing road map information,
The navigation control unit 27, which includes a navigation control unit 27 and a display 28, receives signals from various sensors, calculates the current position and traveling direction of the vehicle, and displays the current position and traveling direction of the vehicle on a road map projected on the display 28. The direction is indicated by a predetermined mark.

Although the navigation system 21 currently on the market displays on the display 28 only when a driver is needed, in this embodiment, the ignition key switch is turned on regardless of the driver's intention. In this case, the navigation control unit 27 is constantly operated to calculate the current position of the vehicle, and information on the current position is sent to the automatic stop / restart controller 10 via the communication line 29. Then, the automatic stop / restart controller 10 determines whether or not the vehicle is on the highway based on the current position information, and when the vehicle stops on the highway or when the vehicle stops immediately after it is no longer on the highway. In order to drive an engine-driven cooling water circulation pump (not shown), the engine is prevented from being automatically stopped and the engine is operated to prevent overheating of the engine.

Here, the contents of control at the time of automatic stop executed by the automatic stop / start controller 10 will be described with reference to the following flowchart.

First, the flowchart of FIG. 3 is for executing the process of automatic stop, and is executed at regular time intervals (for example, every 10 minutes).
msec).

In step 1, it is determined whether or not a condition for permitting idle stop (automatic stop) is satisfied. Here, the idle stop permission condition includes, for example, the following.

The state of charge (SOC) of the battery is within a predetermined range.

The cooling water temperature of the engine is within an appropriate range (for example, after completion of warm-up).

When all of the above two conditions are satisfied, it is determined that the idle stop permission condition is satisfied, and the routine proceeds to steps 2 and 3, where the vehicle speed detected by the vehicle speed sensor 18 and the vehicle speed detected by the brake sensor 11 are detected. Check the brake state.

If the vehicle speed is 0 km / h and the brake is in operation, the routine proceeds to step 4. In this case, in the conventional device, when the vehicle speed is 0 km / h and the brake is in operation (that is, when the vehicle is stopped) immediately after the vehicle stops on the highway or immediately after the vehicle stops on the highway, the engine stop command is issued immediately to automatically start the engine. In contrast to this, in the present embodiment, the engine stop operation is performed after it is determined whether the vehicle is on the highway or immediately after the vehicle is no longer on the highway. For this reason, in the present embodiment, an automatic stop prohibition flag in step 4 is newly provided, and this flag is set to 1 when the vehicle is on an expressway or immediately after it is no longer on an expressway, as described later.
That is, when the flag = 1, the automatic stop is prohibited.
Proceeding from step 4 to step 6, an engine operation command is issued.

On the other hand, when the flag is 0, the process proceeds from step 4 to step 5, and an engine stop command is issued as in the conventional apparatus.

On the other hand, when the vehicle speed is not 0 km / h or when the brake is not operated even when the vehicle speed is 0 km / h,
Proceeding to step 6 from step 2 or 3, an engine operation command is issued.

The engine operation command includes an engine start command at the time of starting. For example, when the foot is released from the brake pedal after the automatic stop of the engine, the process proceeds to step 6. In this case, a motor torque is set for starting and an engine start command is issued.

The flowchart of FIG. 4 is for performing the highway correspondence processing, and is executed at regular intervals (for example, every 10 msec) independently of the flowchart of FIG.

In step 11, it is determined whether or not the current position is on the highway based on the current position information of the vehicle from the navigation control unit 27.

If the current position is on the expressway, it is determined that the driving of the cooling water circulation pump is necessary, and the process proceeds to steps 12 and 13 where the expressway flag and the automatic stop prohibition flag (both are set to "0"). (Initial setting) (highway flag = 1, automatic stop prohibition flag = 1).

If the vehicle is not on the highway, the process proceeds from step 11 to step 14, where the highway flag is set to "0", and in steps 15 to 17, the elapsed time since the vehicle is no longer on the highway is measured. First, at step 15, it is determined whether or not the highway flag has been inverted from "1" to "0". At the timing when the expressway flag is inverted from "1" to "0" (that is, when the expressway flag is no longer on the expressway), the process proceeds to step 16 to start the timer t (t = 0), and the timing when the expressway flag is inverted. If not, the process proceeds from step 15 to step 17 to count up the timer t.

In step 18, the timer t and the predetermined value T
Compare. Here, the predetermined value T is a criterion (for example, one minute) for determining whether or not the cooling water circulation pump needs to be driven after leaving the highway, and when t <T (that is, when the vehicle is not on the highway, Also, when the vehicle is stopped in a state where T has not elapsed since the start of the process), it is determined that the cooling water circulation pump needs to be driven, and the process proceeds to step 13 to set the automatic stop prohibition flag = 1.

On the other hand, when t ≧ T (that is, when the vehicle stops after T has passed since it was not on the highway),
Since the engine does not overheat even when the automatic stop is performed, the process proceeds from step 18 to step 19, and the engine stop operation is started with the automatic stop prohibition flag = 0.

Here, the operation of the present embodiment will be described.

In the conventional apparatus, if the vehicle is stopped because the vehicle has been traveling at high speed on the highway and has reached the toll booth, or if the vehicle has been traveling at high speed so far on the highway but has been stopped due to traffic congestion ahead. For example, the engine is automatically stopped, and the cooling water circulation pump does not operate due to the stop of the engine, so that there is a possibility of overheating. Similarly, when the vehicle stops immediately after leaving the highway after high-speed driving, the engine is automatically stopped, and there is a possibility of overheating at this time.

On the other hand, in the present embodiment, when the vehicle is stopped on the highway or when the vehicle stops before the predetermined time elapses after the vehicle stops on the highway, the engine is not automatically stopped. The engine is operated.
For this reason, as described above, when the vehicle was stopped because it was running at a high speed up to the tollgate on the expressway, and when the vehicle was stopped because of traffic congestion ahead while it was running at a high speed so far on the highway. Alternatively, when the vehicle stops immediately after leaving the highway after high-speed traveling, the automatic stop of the engine is prohibited in any case, and the operation of the engine is continued to operate the cooling water circulation pump, thereby preventing overheating.

In this embodiment, the navigation system is used to prohibit the automatic stop of the engine when the vehicle stops immediately after high-speed driving. Therefore, the automatic engine stop when the vehicle stops immediately after high-speed driving is simple. It can be surely prohibited by the method.

FIG. 5 is a flowchart of the second embodiment.
This is a replacement for FIG. 4 of the first embodiment. The same steps as those in FIG. 4 are denoted by the same step numbers.

In the first embodiment, the automatic stop prohibition flag is set based on the highway flag, but in the second embodiment, the automatic stop prohibition flag is set based on the highway travel flag (steps 21 and 22). . The control is the same as in the first embodiment except that the names of the flags are different. That is,
High-speed running flag = 1 (steps 21 and 1 in FIG. 5)
3) when the vehicle is stopped, and when the vehicle is stopped in a state where the predetermined time T has not elapsed since the high-speed running flag is not 1 (steps 21, 22, 16, 17, 18, and 13 in FIG. 5). , The automatic stop of the engine is prohibited, and the operation of the engine is continued (steps 1, 2, 3,
4, 6).

The setting of the high-speed running flag (high-speed running determination) will be described with reference to the flowchart of FIG.
6 is independent of FIG. 5 at fixed time intervals (for example, 10 msec).
Every).

Here, since high-speed traveling is mainly performed on the highway, in the first embodiment, it is determined whether or not the vehicle is on the highway using the road information from the navigation control unit 27. Since the second embodiment is intended for a vehicle having no navigation system, it is determined whether the vehicle is running at a high speed based on the vehicle speed sensor 24.

In FIG. 6, the high-speed running flag is checked in step 31. When the high-speed running flag is 0, the routine proceeds to step 32 and subsequent steps. In step 32, the average vehicle speed VSPAV is compared with a predetermined value V1. Here, the predetermined value V1 is a criterion for determining whether the vehicle is traveling at high speed (for example, 80 km / km).
In h), when the average vehicle speed VSPAV is less than the predetermined value V1, the current process is terminated (the high-speed running flag remains 0).

When the average vehicle speed VSPAV is equal to or higher than the predetermined value V1, it is determined that the vehicle has entered high-speed running, and step 33 is executed.
Proceeding to 35, the time during which the average vehicle speed VSPAV is equal to or higher than the predetermined value V1 is measured. First, in step 33, it is determined whether the average vehicle speed VSPAV has become equal to or higher than the predetermined value V1 for the first time. Only when it is the first time, the process proceeds to step 34 to start the timer t1 (t1 = 0). After the second time, the process proceeds to step 35 to count up the timer t1.

In step 36, the value of the timer t1 is compared with a predetermined value T1. Here, the predetermined value T1 is a criterion (5 minutes) for determining whether the vehicle is traveling at high speed.
When t1 ≧ T1 (that is, when the time during which the average vehicle speed VSPAV has become equal to or more than the predetermined value V1 has elapsed T1), it is determined that the vehicle is traveling at high speed, and the routine proceeds to step 37, where the high-speed traveling flag = 1.

However, the average vehicle speed VSPAV is equal to a predetermined value V1.
Even if it is above, the average vehicle speed VSPAV is equal to the predetermined value V1.
If the above time has not passed T1, the current process is terminated as it is (the high-speed running flag remains 0).

On the other hand, when the high-speed running flag = 1, the process proceeds from step 31 to step 38, and this time the average vehicle speed VSP
AV is compared with a predetermined value V2. Here, the predetermined value V2 is a criterion (for example, 60 km / h) for determining whether or not the vehicle has entered a state where high-speed running is stopped.
If the AV exceeds the predetermined value V2, the current process is terminated as it is (the high-speed running flag remains 1).

When the average vehicle speed VSPAV becomes equal to or less than the predetermined value V2, it is determined that the vehicle has not entered the high-speed running mode. The elapsed time is measured, and the value of the timer t2, which is the measured time value, and a predetermined value T2
Compare. The processing in steps 39 to 42 is performed in step 3
This is the same as the processing in steps 3 to 36. First, in step 39, it is determined whether or not it is the first time that the average vehicle speed VSPAV has become equal to or less than the predetermined value V2. Only when it is the first time, the process proceeds to step 40 to start the timer t2 (t2 = 0). After the second time, the process proceeds to step 41 to count up the timer t2.

In step 42, the value of the timer t2 is compared with a predetermined value T2 (for example, one minute). When t2 ≧ T2 (when the time during which the average vehicle speed VSPAV has become equal to or less than the predetermined value V2 has elapsed T2), it is determined that the vehicle is not running at high speed, and the routine proceeds to step 43, where the high speed running flag = 0.

On the other hand, even if the average vehicle speed VSPAV is equal to or lower than the predetermined value V2, if the time during which the average vehicle speed VSPAV is equal to or lower than the predetermined value V2 has not passed T2, the vehicle is not running at high speed. Since this is immediately after entering, the current processing is terminated as it is (the high-speed running flag =
1).

The above average vehicle speed VSPAV may be calculated by a load averaging process or a simple averaging process using the vehicle speed VSP detected by the vehicle speed sensor 18. The reason why the average vehicle speed VSPAV is used to determine whether the vehicle is running at high speed and whether the vehicle is not running at high speed is to make the vehicle less susceptible to instantaneous acceleration and deceleration.

Here, the operation of the second embodiment will be described. The time when the average vehicle speed VSPAV becomes equal to or higher than the predetermined value V1 and the average vehicle speed VSPAV becomes equal to or higher than the predetermined value V1 is represented by T1.
When the elapsed time (that is, during high-speed running), the high-speed running flag =
It becomes 1. Considering the case where the vehicle is stopped by depressing the brake pedal to stop the vehicle from this state,
The average vehicle speed VSPAV drops to V2 via V1 and finally reaches 0.
km / h. At this time, the high-speed running flag changes from <1> to <3> as follows.

<1> When V1>VSPAV> V2: High-speed running flag = 1.

<2> When the elapsed time since VSPAV ≦ V2 is less than T2: High-speed running flag = 1.

<3> When the elapsed time since VSPAV ≦ V2 is equal to or longer than T2: High-speed running flag = 0.

From these changes, the VSPA after running at high speed
Elapsed time after V ≦ V2 is less than T2 and vehicle speed = 0
km / h (that is, when the vehicle is stopped in a short time after running at high speed), since it corresponds to the above <2>,
The high-speed running flag becomes 1 at the timing of stopping the vehicle. In other words, when the vehicle is stopped, the high-speed running flag =
When it is 1, the vehicle is stopped immediately after traveling at high speed, and at this time, the engine is operated without automatically stopping the engine (steps 2, 3, 4, and 6 in FIG. 3).
For this reason, as in the first embodiment, when the vehicle is stopped on the highway up to the toll booth because the vehicle has been running at a high speed until then, the vehicle has been running at a high speed so far on the highway but there is a traffic jam ahead. When the vehicle is stopped or when the vehicle is stopped immediately after leaving the highway after high-speed traveling, the automatic stop of the engine is prohibited, and the pump for cooling water circulation operates by operating the engine, thereby preventing overheating.

In the embodiment, the predetermined values T, T1, V1, T
Although specific numerical values are shown for 2, V2, these vary depending on the engine and vehicle, and must be finally determined by matching.

In the embodiment, a vehicle having an engine without a supercharger has been described. However, the present invention can be applied to a vehicle having an engine with a supercharger. In this case, the condition determination as to whether or not to prohibit the automatic stop of the engine when the vehicle stops immediately after traveling at high speed is simpler than the conventional device based on the estimated supercharger temperature (Japanese Patent Laid-Open No. 9-42003).

In the embodiment, the navigation system using the GPS antenna has been described, but the present invention is not limited to this. For example, there is a navigation system using a road traffic information beacon of VICS (information communication system for providing congestion information and the like), but this system may be used.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a navigation system.

FIG. 3 is a flowchart illustrating a process of automatically stopping an engine.

FIG. 4 is a flowchart for explaining a highway correspondence process.

FIG. 5 is a flowchart illustrating a highway correspondence process according to the second embodiment;

FIG. 6 is a flowchart illustrating a high-speed traveling determination according to a second embodiment.

FIG. 7 is a diagram corresponding to claims of the first invention.

FIG. 8 is a diagram corresponding to claims of the second invention.

FIG. 9 is a diagram corresponding to claims of the third invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 2 Motor generator 3 Transmission 10 Automatic stop / restart controller 11 Brake sensor 18 Vehicle speed sensor 21 Navigation system 1 Navigation control unit

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 3G092 AA01 AA02 AB02 AC03 FA30 FA38 HE01Z HE08Z HF08Z HF12Z HF21Z HF26Z HG04Z 3G093 AA05 AA06 AA07 AA14 AA16 BA04 BA21 BA22 DA01 DA05 DA06 DB00 DB05 DBEB

Claims (7)

[Claims] 1. A vehicle comprising a controller having a function of automatically stopping an engine of a vehicle when a predetermined operating condition is satisfied and automatically restarting the engine when another predetermined operating condition is satisfied. The engine-driven cooling water circulation pump, wherein the controller determines whether or not the vehicle is on the highway when the vehicle stops, and based on the determination result, automatically stops the engine when the vehicle is on the highway when the vehicle stops. An engine automatic stop / restart device for a vehicle having a prohibition function. 2. A vehicle comprising a controller having a function of automatically stopping an engine of a vehicle when a predetermined operating condition is satisfied and automatically restarting the engine when another predetermined operating condition is satisfied. The engine-driven cooling water circulating pump, the controller determines whether or not the vehicle has just stopped on the highway when the vehicle is stopped. A function of prohibiting the automatic stop of the engine at one time. 3. A vehicle equipped with a controller having a function of automatically stopping an engine of a vehicle when a predetermined operating condition is satisfied and automatically restarting the engine when another predetermined operating condition is satisfied. A function of determining whether or not the vehicle is stopped immediately after high-speed traveling, comprising the engine-driven cooling water circulation pump,
A function of prohibiting the automatic stop of the engine when the vehicle is stopped immediately after traveling at a high speed based on the determination result. 4. The automatic engine stop / restart system according to claim 1, wherein whether the vehicle is on an expressway is determined based on information from a navigation system. 5. The automatic engine stop / restart system for a vehicle according to claim 2, wherein it is determined whether or not the vehicle has just disappeared on an expressway based on information from a navigation system. 6. A means for judging whether or not the vehicle is stopped immediately after traveling at a high speed, determines that the vehicle is traveling at a high speed when the state in which the vehicle speed is equal to or higher than a first predetermined value continues for a first predetermined time or more. Means, and the state where the vehicle speed is less than the first predetermined value and less than or equal to the second predetermined value which is smaller than the first predetermined value does not continue for a second predetermined time when the previous determination is high-speed running. Means for determining that the vehicle is traveling at high speed when the vehicle is not traveling at high speed, and determining that the vehicle is not traveling at high speed if the state where the vehicle speed is equal to or higher than the first predetermined value does not continue for the first predetermined time if the previous determination is not high speed driving Means for determining that the vehicle is not running at high speed when the vehicle speed is equal to or lower than the second predetermined value for more than the second predetermined time; Means for determining whether DOO engine automatic stop and restart device for a vehicle according to claim 3, characterized in. 7. The automatic engine stop / restart system according to claim 6, wherein the vehicle speed is an average vehicle speed.